Inclosed electric fuse.



:w. J. MORGAN.

INULOSED ELECTRIC FUSE. APPLICATION FILED AUG. 5, 1912. RENEWED AUG. 20,1913.

1,074,806. Patented 0ct.7,1913.

'ing had to UNITED STATES PATENT OFFICE.

WILLIAM J. MORGAN, or-s'r. LOUIS, mrssou'm, ASSIGNOR, BY manor AND MESNEassreunnnrs, ro ALFRED L. susrrcn,

OF CHICAGO, ILLINOIS.

INCLO SED ELECTRIC FUSE.

Application filed August 5, 1912,

Patented Oct. '7, 1913.

To all whom it may concern;

Be it known that I, WILLIAM J. MORGAN, a citizen of the United States,residing at the city of St. Louis, State of Missouri, have invented acertain new and useful Improvement in Inclosed Electric Fuses, of whichthe following is a specification, reference bethe accompanying.drawings, forming a part hereof, in which- Figure 1 is a perspectiveview of an inclosed electric fuse embodying my invention; Fig. 2 is alongitudinal sectional view therethrough; and Fig. 3 is a sectional viewof the line 3-3, Fig. 2.

This invention relates to a certain new and useful improvement ininclosed electric fuses.

Inclosed electric fuses of the class to which my invention isparticularly applicable are usually made up of or. comprise an openended tubular casing preferably of suitable fibrous material closed atits ends by metallic caps, through which caps, in the form of fuse shownin the accompanying drawings, pass into the interior of the casingcontact lades or terminals which are bridged across within the casing bymeans of a fusible element having a current carrying capacit less thanthe current carrying capacity 10 said blade terminals and adapted tocarry the current up to a certain rated amperage and to blow or fuse onan'overload or increased current and thereby protect'the electriccircuit in which the fuse may be arranged, as

will be well understood. In other forms of fuses, and particularly offuses adapted for use with currents of comparatively small voltage, thefusible element maybe directly attached at its ends to the caps whichclose the ends of the tubular casing Within the casing and surroundingthe usible element is a filling of suitable material,

preferably in a finely-divided state, such as slaked lime,

the function of which is to dissipate the heat and provide minute pathsor interstices for the escape of the vapor orgas arising or evolved uponthe fusing or blowlng of the fusible element.

On the blowing of the fusible element, usually only the fusible elementand the surrounding filling are affected, the remaining arts of the fuseremaining intact and uninured, and generally heretofore, on the blowingof the fusible element, the entire fuse either had-tote discarded andthrown away or disrupted and taken apart to supply or furnish the samewith a new filling and with a new fusible element. The object of myinvention is to so construct a fuse ofthe kind stated, whereby, on theblowing or fusing of the fusible element, the melted or fused particlesthereof and the affected filling therearound may be readily and quicklyremoved from the casing and anew fusible element and a new fillingreadily placed within the casing without requiring or necessitating thedismantling and consequent re-assembling of the main elements of thefuse, resulting in a saving in labor and material and reducing the costof replacing burnt-out or disrupted fuses. v With this object in view,my invention resides in the provision of a fuse of the class statedhaving a closable opening and means for normally closing the same,whereby, on the disrupting of the fusible element, the

affected filling and melted or fused particles of the fusible element mabe easily and readily removed and replace by a new element and filling,the closure for said'opening forming, when in closed or normal position,

a part of the casing of the-fuse, an incertam novel featuresofconstruction, arrange- 'ment, and combination of parts, allas willhereinafter be described and "afterward pointed out in the claims.

Referring by numerals to the accompanyi'n'g drawings, the fuse thereshown comprises an open ended tubular casing 1, preferably of suitablefibrous material, and which casing may be of any suitable length anddiameter as desired according to the size or required carrying orrated'ca'pacity of the fuse.

2-2 indicate metallic cup-shaped caps which are suitably fixedlysecured, as by means of screws or the like 3, on, and which are adaptedto close, the ends of casing 1.

4.-4 indicate blade terminals which pro- 'ect through caps 2H2 asuitable distance mto the interior of casing 1 at its opposite ends, asshown particularly in Fig. 2, and

. bridging the space between the inner ends of terminals 4 within casing1 .and suitably electrically connected thereto, as by metallic screws orthe like 5, is a fusible element 6 having a current carrying capacityless than the current carrying capacity of blade arms 4-4 and adapted tofuse or blow on an overload or on an increase in current over its ratedcapacity. Surrounding this fusible element 6 and filling the interior ofeasing 1 is a filling 7 of any suitable material, preferably in a finelydivided state, such as slaked lime, adapted to dissipate the heat andprovide minute paths or interstices for the escape of the vapor or gasarising or evolved upon the fusing or blowing of the fusible element.

Casing 1 is longitudinally cut away to provide a circumferentialpreferably rectanof casing 1, as shown in Fig. 1, is a closure, 8substantially arc-shaped 1n cross-sect1on.

and of material preferably similar to or like the material of casing 1.As shown particularly in Fig. 2, this closure 8 is adapted, when innormal position, to project at one end beneath the edge of cap 2 and bethereby at that end secured in position. To firmly secure closure 8 innormal position at its other end, I have provided a short preferablymetallic section or plate,

9, which is fixe'd within casing 1 by means of a pin or stud 10 passingthrough said plate, casing 1, and cap 2, this plate 9 extending at oneend beneath one end of opening 1, and to which plate 9 said end ofclosure 8, when closure 8 is in normal posi-' tion, is removably firmlysecured by means of a short screw or the like 11, as shown particularlyin Fig. 2. As will be seen, this closure 8, when in normal position,practically forms partof casing 1, thel edges of closure 8 and ofopening 1 of easing 1 being preferably oppositely beveled, so that,

when closure 8 is in normal position, said edges neatly match and asubstantially airtight joint is formed therebetween.

, On the blowing of fusible. element 6, it will be apparent that, byunscrewing screw 11, closure 8 may be readily removed from .its seat,when old or used filling 7 and the melted or fused particles of blownfuse 6 may be readily removed without requiring or necessitating adismantling, and conse- I quent reassembling, of the remaining parts ofthe fuse, and a new filling and element placed in position within casing1, when coveror closure 8 may be again securedin closed or normalposition. c

I may here state that I have found that a fuse constructed in accordancewith, and embodying, my invention will safely meet and withstand themost severe service tests and, in every way, fully perform and ac-.complish the object hereinbefore stated; and

while I have herein shown and described my invention as applied to, orin connection with, an in'closed fuse of a particular construction, itis to be understood that my invention may be equally well applied toinclosed fuses varying in construction therefrom.

I am aware that minor changes in the construction, arrangement, andcombination of the several parts of my invention may be made andsubstituted for those herein shown and described without departing fromthe nature and principle of my invention.

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

1. In a fuse, an open ended tubular casing, cup shaped caps arranged on,and closing, the ends of said casing, said casing being longitudinallyprovided with an' elongated circumferential opening through which accessmay be had from the exterior...

intof'the interior thereof, anelongated clm suresubstantially arc shapedin cross-section for removably. closing said opening,\a short metallicsection fixed within said casing andprojecting below said opening, and ascrew adapted to pass through said closure and seat insaid metallicsection to removably secure said closure to said casing; substantiallyas described.

2. In a fuse, an open-ended tubular casing, cup-shaped caps arranged on,and closing, the ends of said casing, said casing being longitudinallyprovided with an elongated circumferential o ening through which accessmay be had om the exterior into the interior thereofian elongatedclosure substantially arc-shaped in cross section forremovably closingsaid opemng, one

end of saidclosure lying under the projecting edge of one ofsaid capswhen said closure is m nor'inal closing position, and means adapted toremovably secure the other end of said closure to said casing;substantially as described.

3. In a fuse, an open ended tubular casing, cup-shaped caps arranged on,and closing, the ends of said casing, said casing being longitudinallyprovided with an elongated circumferential o ening through removablysecure the other end of said 010-. sure to said casing; substantially asdescribed.

4. In a fuse, an open ended tubular casing, and closing, said casingbeing with an elongated through which acexterior into the closuresubarranged on,

cup-shaped caps the ends of said casing, longitudinally providedcircumferential opening cess may be had from the interior thereof, anelongated stantially arc-shaped in cross-section removably closing saidopening,

normal closin vposition,

one end of said closure lying under the projecting edge of one of saidcaps when said closure is 1n a short metallicsection fixed wit in saidcasing and projecting at one end below said opening, and a screw adaptedto pass through said closure and seat in said metallic section toremovably secure the other end of said closure to said casing, the outerfaces of said casing and said closure being substantially flush whensaid closure is in" normal closlng position; substantially as described.I

In testimony whereof, I have signed my 25 name to this specification inthe presence of two subscribing witnesses.

WILLIAM J. MORGAN.

for

Witnesses:

RUTH PETERSON, ZELMA Pincus.

